From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Thu, 9 Mar 2023 20:50:15 -0800
Subject: [PATCH] Max pending logins

Should help the floodgates on launch

diff --git a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
index 58cdb65083134680230d7070f9f6209f2d32873b..aa4b461bbb2c8c4753f7c9057bab1740de2c0284 100644
--- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -89,7 +89,7 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
             if (this.server.getPlayerList().pushPendingJoin(name, uniqueId, this.connection)) {
             // Folia end - region threading - rewrite login process
             this.verifyLoginAndFinishConnectionSetup((GameProfile) Objects.requireNonNull(this.authenticatedProfile));
-            } // Paper - prevent logins to be processed even though disconnect was called
+            } else { --this.tick; } // Paper - prevent logins to be processed even though disconnect was called // Folia - max concurrent logins
         }
 
         if (this.state == ServerLoginPacketListenerImpl.State.WAITING_FOR_DUPE_DISCONNECT && !this.isPlayerAlreadyInWorld((GameProfile) Objects.requireNonNull(this.authenticatedProfile))) {
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index 12502d9db5bae29ed642e179f3a19d433ac7df25..ebbe5dda644a06bfd4769934e33402b2c009c7e2 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -172,6 +172,17 @@ public abstract class PlayerList {
             conflictingId = this.connectionById.get(byId);
 
             if (conflictingName == null && conflictingId == null) {
+                // Folia start - max concurrent login
+                int loggedInCount = 0;
+                for (Connection value : this.connectionById.values()) {
+                    if (value.getPacketListener() instanceof ServerGamePacketListenerImpl) {
+                        ++loggedInCount;
+                    }
+                }
+                if ((this.connectionById.size() - loggedInCount) >= io.papermc.paper.configuration.GlobalConfiguration.get().misc.maxJoinsPerTick) {
+                    return false;
+                }
+                // Folia end - max concurrent login
                 this.connectionByName.put(userName, conn);
                 this.connectionById.put(byId, conn);
             }